Dell Latitude C640 - Manual (Page 16)

5. To release the keyboard from the palm rest, use a small, flat-blade screwdriver or plastic scribe to pry up the right
edge of the keyboard near the blank key.
1 keyboard
2 track stick
3 blank key
4 palm rest
6. Lift the keyboard straight up about an inch and then rotate it forward toward the front of the computer, until the key
face is resting on the palm rest.
NOTICE: Do not pull on the keyboard flex and track stick cables.
7. Pull up on the keyboard connector to disconnect it from the keyboard interface connector on the system board.